Full coverage health insurance (including 80% reimbursed for out of network/out of country) about 250-300 shek per month.
Schools are about 100-150 per month, with free day care if over 3 years old. Private day care is about 600 per month.
Car on short terms (month to month) rental about $600. Rent in a 3 bedroom in RBS should run about 3000-3500 shek.
I think what can throw a wrench in the calculations is what is considered a luxury. You look at not eating out as non-extravagant, but here orange juice is considered a luxury, and the price (~$8 a bottle) reflects that.